NotSUSYNorHiggs Exotic Searches at TeVatron Run II - PowerPoint PPT Presentation

Title: NotSUSYNorHiggs Exotic Searches at TeVatron Run II


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Not-SUSY-Nor-Higgs Exotic Searches at TeVatron
Run II

• Marumi Kado
• LAL-Orsay

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Synopsis, Selected Topics
Topics will be discussed in three main classes
- Searches for high mass resonances -
Searches for new particles decaying to visible
known particles - Search for particles
escaping undetected in topologies with MET
Upon request
All limits will be given at the 95 Confidence
Level
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Search for High Mass Resonances

• DiLepton and DiPhoton High Mass Analyses

For instance in ED models
Simple event selection Two flavor-like and
opposite-charge leptons (e or m) or photons with
PT / ET in excess typically of 25
GeV/c Interpretation of the ll invariant mass
spectrum
200 pb-1
CDF less model dependence, only spin assumption
(0,1,2)
DØ Model dependent interpretation
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ll Interpretation in terms of Z and Little Higgs
Searches
CDF and DØ have excluded Z masses in the E6
Grand Unified Model CDF uses fits to the
invariant di-lepton mass assuming a spin-1
resonance
Different E6 models
200 pb-1
SM like Z
Ruled out 2TeV by LEP
Different E6 models
Within E6 models limits better than LEP indirect
limits
CDF has also interpreted this search in the
Little Higgs Model which predicts a heavy
neutral boson Zh (for cotan q 1)
ee
mm
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• ll and gg Interpretation in terms of RS Resonance

Hierarchy problem solved with one warped ED in a
5D AdS Space with metric The smaller k/MPl
the narrower the first KK excitation, but smaller
s CDF uses fits to the invariant di-lepton mass
assuming a spin-2 resonance
Cross Section Limits for different k/MPl
Exclusion domains in the RS graviton model
ee
ee
The gg exclusion profits from a higher BR at high
mass
DØ 200 pb-1
mm
gg
DØ (ee) CDF
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• Search For High Mass Resonances in the Dijet Mass
  Spectrum

CDF have interpreted their 75 pb-1 Dijet mass
spectrum searching for resonances coupling
strongly
Excluding exotic particle masses (axigluon,
Excited Quark, color octet Technirho) between
280 and 410 GeV/c2
Excluding RS graviton between 220 and 840 GeV/c2
(k/MPl0.3)
Axigluon reach up to 1,1 TeV/c2
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• A Non-Resonant Case (due to the mass continuum of
  the KK states) ADD models

Hierarchy problem using n large compactified EDs
In the ADD case the search is based on the
dilepton and diphoton differential s
KK Graviton exchange
Interference
DØ Inclusive approach including e and g as EM
objects Two dimensional binned likelihood
fit M2EM and cos q With 200 pb-1 (Combined
with Run I) Same in mm with 100 pb-1

CDF Simple fit to Mee with 200 pb-1
Limits given in the GRW model where
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New Particles Decaying to known Ones

• Search for Excited Leptons Radiative Decays the
  eeg Topology

CDF has performed a model dependent search (200
pb-1)
3 bkg. events expected and 3 events observed
Two signal production models considered
Gauge boson mediated
Contact interaction
For Me L
For Me L/f
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• Searches for LeptoQuarks

LeptoQuarks are bosons with color and fractional
electric charges and with both baryon and lepton
numbers predicted in GU theories
LeptoQuarks couple to lepton and quarks of the
same generation
Charged leptons coupling parameter
bBR(LQ?(e,m,t)q)
LQ are produced in pairs at TeVatron
Searched for the first and second generation in
three main topologies - Two leptons and two
jets (eejj, mmjj) - One Lepton and two
jets and MET (enjj) - Two Jets and MET
(nnjj)
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Searches for First Generation LeptoQuarks
DØ performed a combined search for first
generation LQs in both the eejj and enjj channels
within 175 pb-1
eejj selection Two isolated electrons and two
jets, the radiative Z events are removed by an ee
invariant mass cut, a large total ET is required
0.4 bkg. events expected and 0 events observed
enjj selection One isolated electron, two jets
and MET (isolated from the lepton), high MTen and
a large total ET
4.7 bkg. events expected and 2 events observed
Combined Result
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Search for Second Generation LeptoQuarks
CDF performed a search for second generation LQs
in the mmjj channels within 200 pb-1
mmjj selection Similar event selection as in
the eejj channel with an additional cut in the
SPTm vs. SETj
3.1 bkg. events expected and 2 events observed
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Search Independent of the LeptoQuark Generation
CDF performed a search for any generation LQs in
the nnjj channel within 191 pb-1
nnjj selection Lepton veto, two or three Jets
and MET isolated from the jets
118 bkg. events expected and 124 events observed
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Search for Particles Undetected in Topologies
with MET

• JetsMET/Monojet Analysis

DØ performed a search for large extra dimensions
(ADD) in the JetsMET channel within 85 pb-1
KK gravitons produced with one or more jets
Monojet selection At least one jet with 150 GeV
ET and MET (isolated from the jet) in excess of
150 GeV
100 bkg. events expected and 84 events observed
Limit on MS vs. n
LEP
No k factor
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Conclusion
DØ and CDF have analyzed up to 200 pb-1 of data
in the framework of searches for
Not-SUSY-Nor-Higgs Searches and have exceeded the
Run I performance in most of the analyses
However DØ and CDF have now accumulated about
350 pb-1 of data Most results will be updated
within a few weeks
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• Model Independent Search em

Very clean signature worth a model independent
inclusive search
DØ search performed within 100 pb-1
Interpretation of the observed MET spectrum in
terms of an excluded domain in acceptance times
Cross section